近年来用电子胎儿监护装置作为高危孕妇产前监护,了解胎儿储备功能日渐普及。无负荷试验(NsT)由于方法简单、对母婴安全、无禁忌证、试验时间短,易于为孕妇所接受,常被优先使用。但NST有一定数量的无反应型,其中一部分是受孕周过小、使用镇静 In recent years, electronic fetal monitoring device as a high-risk prenatal care of pregnant women to understand the increasing popularity of fetal reserve function. No-load test (NsT) Because of the simple method, the mother and child safety, no contraindications, short test time, easy to accept for pregnant women, often preferentially used. However, there is a certain amount of NST non-responsive type, part of which is conception week is too small, the use of sedation